<template>
    <div>
         <!-- 面包屑导航区 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区域 -->
    <el-card>
        <!-- 警告区域 -->
        <el-alert title="注意：只允许为第三级分类设置相关参数！" type="warning" :closable="false" show-icon>
        </el-alert>

        <!-- 选择商品分类区域 -->
        <el-row class="cat_opt">
            <el-col>
                <span>选择商品分类：</span>
                <!-- 选择商品分类的级联 -->
            <el-cascader
                v-model="selectedCateKeys"
                :options="catelist"
                expand-trigger="hover" 
                @change="handleChange"
                :props="cateProps">
                </el-cascader>
            </el-col>
        </el-row>
        
        <!-- tab页签区域 -->
         <el-tabs v-model="activeName" @tab-click="handleTabClick">
             <!-- 添加动态参数的面板 -->
            <el-tab-pane label="动态参数" name="many">
                <el-button type="primary" size="small" :disabled="isBtnDisabled" @click="addDialogVisible =true">添加参数</el-button>
                <!-- 动态参数表格 -->
                <el-table :data="manyTableData" border stripe>
                    <!-- 展开行 -->
                 <el-table-column type="expand">
                     <template slot-scope="scope" >
                         <!-- 循环渲染标签Tag -->
                        <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i,scope.row)">
                             {{item}}
                        </el-tag>
                        <!-- 输入的文本框 -->
                        <el-input
                            class="input-new-tag"
                            v-if="scope.row.inputVisible"
                            v-model="scope.row.inputValue"
                            ref="saveTagInput"
                            size="small"
                            @keyup.enter.native="handleInputConfirm(scope.row)"
                            @blur="handleInputConfirm(scope.row)"
                            >
                        </el-input>
                        <!-- 添加的按钮 -->
                        <el-button v-else class="button-new-tag" size="small"  @click="showInput(scope.row)">+ New Tag</el-button>
                     </template>
                 </el-table-column>
                    <!-- 索引列 -->
                    <el-table-column type="index"></el-table-column>
                    <el-table-column label="参数名称" prop="attr_name"></el-table-column>
                    <el-table-column label="操作" >
                        <template slot-scope="scope">
                            <el-button type="primary" icon="el-icon-edit" size="small" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                            <el-button type="danger" icon="el-icon-delete" size="small" @click="removeParams(scope.row.attr_id)">删除</el-button>
                        </template>
                    </el-table-column>
                </el-table>
                
            </el-tab-pane>
            <!-- 添加静态属性的面板 -->
            <el-tab-pane label="静态属性" name="only">
                <el-button type="primary" size="small" :disabled="isBtnDisabled" @click="addDialogVisible =true">添加属性</el-button>
                <!-- 静态属性表格 -->
                 <el-table :data="onlyTableData" border stripe>
                    <!-- 展开行 -->
                 <el-table-column type="expand">
                     <template slot-scope="scope" >
                         <!-- 循环渲染标签Tag -->
                        <el-tag v-for="(item,i) in scope.row.attr_vals" :key="i" closable @close="handleClose(i,scope.row)">
                             {{item}}
                        </el-tag>
                        <!-- 输入的文本框 -->
                        <el-input
                            class="input-new-tag"
                            v-if="scope.row.inputVisible"
                            v-model="scope.row.inputValue"
                            ref="saveTagInput"
                            size="small"
                            @keyup.enter.native="handleInputConfirm(scope.row)"
                            @blur="handleInputConfirm(scope.row)"
                            >
                        </el-input>
                        <!-- 添加的按钮 -->
                        <el-button v-else class="button-new-tag" size="small"  @click="showInput(scope.row)">+ New Tag</el-button>
                     </template>
                 </el-table-column>
                    <!-- 索引列 -->
                    <el-table-column type="index"></el-table-column>
                    <el-table-column label="属性名称" prop="attr_name"></el-table-column>
                    <el-table-column label="操作" >
                        <template slot-scope="scope">
                            <el-button type="primary" icon="el-icon-edit" size="small" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                            <el-button type="danger" icon="el-icon-delete" size="small" @click="removeParams(scope.row.attr_id)">删除</el-button>
                        </template>
                    </el-table-column>
                </el-table>
            </el-tab-pane>
        </el-tabs>
    </el-card>

    <!-- 添加参数的对话框 -->
    <el-dialog
        :title="'添加'+titleText"
        :visible.sync="addDialogVisible"
        width="50%"
        @close="addDialogClosed">
        <!-- 添加参数的对话框 -->
        <el-form :model="addForm" :rules="addFormrules" ref="addFormRef" label-width="100px" >
            <el-form-item :label="titleText" prop="attr_name">
                <el-input v-model="addForm.attr_name"></el-input>
            </el-form-item>
        </el-form>
        <span slot="footer" class="dialog-footer">
            <el-button @click="addDialogVisible = false">取 消</el-button>
            <el-button type="primary" @click="addParams">确 定</el-button>
        </span>
    </el-dialog>

<!-- 修改参数对话框 -->
    <el-dialog
        :title="'修改'+titleText"
        :visible.sync="editDialogVisible"
        width="50%"
        @close="editDialogClosed">
        <!-- 添加参数的对话框 -->
        <el-form :model="editForm" :rules="editFormrules" ref="editFormRef" label-width="100px" >
            <el-form-item :label="titleText" prop="attr_name">
                <el-input v-model="editForm.attr_name"></el-input>
            </el-form-item>
        </el-form>
        <span slot="footer" class="dialog-footer">
            <el-button @click="editDialogVisible = false">取 消</el-button>
            <el-button type="primary" @click="editParams">确 定</el-button>
        </span>
    </el-dialog>
    </div>
</template>
<script>
export default {
    data(){
        return {
            // 商品分类列表数据
            catelist:[],
            // 级联选择框的配置对象
            cateProps:{
                value:'cat_id',
                label:'cat_name',
                children:'children'
            },
            // 级联选择框双向绑定的数组
            selectedCateKeys:[],
            // 被激活的页签名称
            activeName:'many',
            // 动态参数的数据
            manyTableData:[],
            // 静态属性的数据
            onlyTableData:[],
            // 控制添加对话框的显示和隐藏
            addDialogVisible:false,
            // 添加参数的表单数据对象
            addForm:{
                attr_name:''
            },
            // 添加表单的验证规则对象
            addFormrules:{
                attr_name:[{ required: true, message: '请输入参数名称', trigger: 'blur' },]
            },
            // 控制修改对话框的显示与隐藏
            editDialogVisible:false,
            // 修改的表单数据对象
            editForm:{
               
            },
            // 修改表单的验证规则对象
            editFormrules:{
                attr_name:[{ required: true, message: '请输入参数名称', trigger: 'blur' },]
            },
            // 控制按钮与文本框的切换显示
            inputVisible: false,
            // 文本框中输入的内容
            inputValue:''
        }
    } ,
    created(){
        // 获取所有的商品分类列表
        this.getCateList()
    },
    methods:{
        async getCateList(){
            const {data:res} = await this.$http.get('categories')
            if(res.meta.status != 200){
                return this.$message.error("获取商品分类失败！")
            }
            this.catelist = res.data
            console.log(this.catelist);
            

        },
        // 级联选择框变化会触发这个函数
        handleChange(){
           this.getParamsData()
        },
        // tab页签点击事件的处理函数
        handleTabClick(){
            this.getParamsData()
            console.log(this.activeName);
        },
        // 获取参数的列表数据
        async getParamsData(){
             // 证明选中的不是三级分类
            if(this.selectedCateKeys.length !== 3){
                this.selectedCateKeys = []
                // 把表格参数列表清空
                this.onlyTableData = []
                this.manyTableData = []

                return
            }
            // 证明选中的是三级分类
            console.log(this.selectedCateKeys);
            // 根据所选分类的id，和当前所处的面板，获取对应的参数
            const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,
            {
                params:{
                sel:this.activeName}
                })
                
            if(res.meta.status != 200){
                return this.$message.error('获取参数列表失败')
            }
            

            // 把获取的attr_vals一个字符串分割成字符串数组
            res.data.forEach(item=>{
                item.attr_vals = item.attr_vals?item.attr_vals.split(' '):[]
                // 控制文本框的显示与隐藏
                item.inputVisible = false
                // 文本框中输入的值
                item.inputValue = ''
            })
            console.log(res.data);
            
            if(this.activeName === 'many'){
                this.manyTableData = res.data
            }else{
                this.onlyTableData = res.data
            }

            
        },
        // 添加对话框的关闭事件
        addDialogClosed(){
            this.$refs.addFormRef.resetFields()
        },
        // 点击确定按钮 添加参数
        addParams(){
            this.$refs.addFormRef.validate(async valid =>{
                if(!valid)return
                const {data:res} = await this.$http.post(`categories/${this.cateId}/attributes`,{
                    attr_name : this.addForm.attr_name,
                    attr_sel: this.activeName
                })
                if(res.meta.status !== 201){
                    return this.$message.error('添加参数失败！')
                }
                this.$message.success('添加参数成功！')
                this.addDialogVisible = false
                this.getParamsData()
            })
        },
        // 点击编辑按钮，展示修改的对话框
        async showEditDialog(attr_id){
            // 查询当前参数的信息
            const {data:res} = await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`,{
                params:{attr_sel:this.activeName}
            })
            if(res.meta.status !== 200){
                return this.$message.error('获取参数信息失败！')
            }
            this.editForm = res.data
            this.editDialogVisible = true
            
        },
        // 重置修改的表单
        editDialogClosed(){
            this.$refs.editFormRef.resetFields()
        },
        // 点击确定按钮修改参数信息
        editParams(){
            this.$refs.editFormRef.validate(async valid=>{
                if(!valid) return 
                const {data:res} = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`,
                    {
                        attr_name:this.editForm.attr_name,
                        attr_sel:this.activeName
                    }
                    
                )
                if(res.meta.status !== 200){
                      return this.$message.error('修改参数失败！')  
                      
                    }
                    this.$message.success('修改参数成功！')
                    this.getParamsData()
                    this.editDialogVisible = false
            })
        },
        // 根据id删除对应的参数项
        async removeParams(attr_id){
            const confirmResult = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
            confirmButtonText: '确定',
            cancelButtonText: '取消',
            type: 'warning'
        }).catch(err => err)

        // 用户取消了删除的操作
        if(confirmResult !== 'confirm'){
            return this.$message.info('已取消删除！')
        }

        // 删除的业务逻辑
         const {data:res} = await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`)
         if(res.meta.status !== 200){
             return this.$message.error('删除参数失败！')  
                      
            }
            this.$message.success('删除参数成功！')
            this.getParamsData()
        },
        // 文本框失去焦点，或摁下了 Enter 都会触发
        async handleInputConfirm(row){
        if(row.inputValue.trim().length === 0){
            row.inputValue = ''
            row.inputVisible = false
            return
        }
        //    如果没有return，则证明输入框的内容，需要
        //    做后续处理
        row.attr_vals.push(row.inputValue.trim())
        row.inputValue = ''
        row.inputVisible = false
        // 需要发起请求，保存这次操作
        this.saveAttrVals(row)
        },
        // 点击按钮展示文本输入框
        showInput(row){
            row.inputVisible = true
            // 让文本框自动获得焦点
            // $nextTick 方法的作用，就是当页面上元素被重新渲染
            // 之后，才会指定回调函数中的的代码
            this.$nextTick(_ => {
            this.$refs.saveTagInput.$refs.input.focus();
        });
        },
        // 将attr_vals的操作，保存到数据库
        async saveAttrVals(row){
            // 需要发起请求，保存这次操作
        const {data:res} = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`,{
            attr_name:row.attr_name,
            attr_sel:row.attr_sel,
            // 数据库储存的形式为字符串
            attr_vals:row.attr_vals.join(' ')
        })
        if(res.meta.status !== 200){
            return this.$message.error('修改参数项失败！')
        }
        this.$message.success('修改参数项成功！')
        },
        // 删除对应的参数可选项
        handleClose(i,row){
            row.attr_vals.splice(i,1)
            this.saveAttrVals(row)
        }
        
    },
    computed:{
        isBtnDisabled(){
            if(this.selectedCateKeys.length !== 3){
                return true
            }
            else{
                return false
            }
        },
        // 当前选中的三级分类的id
        cateId(){
            if(this.selectedCateKeys.length === 3){
                return this.selectedCateKeys[2]
            }
            return null
        },
        // 动态计算标题的文本
        titleText(){
            if(this.activeName === 'many'){
                return '动态参数'
            }else{
                return '静态属性'
            }
        },
        
    }
}
</script>

<style scoped>
.cat_opt{
    margin: 13px 0;
}
.el-tag{
    margin: 5px;
}
.input-new-tag{
    width: 150px;
}
</style>